Verification rules for electromagnetic flowmeters

Verification regulation of electromagnetic flowmeters: the verification cycle time of electromagnetic flowmeters with accuracy level 0.2 and higher than 0.2 is 1 year, and the verification cycle time of flow meter with accuracy level less than 0.2 and introduced deviation is 2 years.

The electromagnetic flowmeter is a kind of flowmeter which can calculate the flow rate according to the precise measurement of the induced electromotive force caused by the movement of the conductive liquid in the electromagnetic field by setting a vertical electromagnetic field in the closed pipe.Requirements in the verification cycle time of the national technical specification for metrological verification of the People's Republic of China jjg1033-2007 electromagnetic flowmeter 7.4: the verification cycle time of the flowmeter whose accuracy level is 0.2 and whose accuracy level is higher than 0.2 is 1 year; the verification cycle time of the flowmeter whose accuracy level is less than 0.2 and whose application introduced deviation is 2 years.

Verification rules for electromagnetic flowmeters

Electromagnetic flowmeters work according to the Faraday inductor's law. The total flow size is related to the electromotive force caused by the flow of liquid. This electromotive force is related by the magnetic induction strength, the flow velocity of liquid and the flow area of commodity.However, the magnetic induction intensity can not be accurately measured, are not stable, and the electromagnetic flowmeters are not completely consistent in each construction, so only about a total flow index can be calculated.If you want to exceed higher accuracy, be sure to carry out real flow calibration.

Calibration of the instrument is essential. After a long time of application of the instrument panel, the electronic components will drift along with the harm of working temperature, appropriate, etc., and the relative electromagnetic field will also cause the transformation. In that case, it is necessary to calibrate and calibrate, to see if it is necessary to consider the requirements of accuracy.

The calibration time is mainly looking at your load standard, such as the metering regulation is high, fluid mechanics residue and waste more and environmental standard deviation, electrical scale, damage metrological verification, removal, maintenance metrological verification is not accurate, can carry out the calibration, if the load standard is good, long-term application is normal, there is no need to check.If you have to check, call the announcement can, people let the technology to check.If say in application process, how to detect electromagnetic flowmeter accuracy to prohibit, that can choose to compare method only, that is to say a pipe installs two flowmeters, natural accuracy wants electromagnetic flowmeter high or be about the same, carry out contrast with each other.

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